How to use the maestral.sync.utils.path.is_child function in maestral

def __init__(self, mdbx, async_loader, root="/", parent=None):
        AbstractTreeItem.__init__(self, parent=parent)
        self.icon = get_native_folder_icon()
        self._root = root
        self._mdbx = mdbx
        self._async_loader = async_loader

        self._checkStateChanged = False

        # get info from our own excluded list
        excluded_folders = self._mdbx.get_conf("main", "excluded_folders")
        if root.lower() in excluded_folders:
            # item is excluded
            self._originalCheckState = 0
        elif any(is_child(root.lower(), f) for f in excluded_folders):
            # item's parent is excluded
            self._originalCheckState = 0
        elif any(is_child(f, root.lower()) for f in excluded_folders):
            # some of item's children are excluded
            self._originalCheckState = 1
        else:
            # item is fully included
            self._originalCheckState = 2

        # overwrite original state if the parent was modified
        if self._parent and self._parent._checkStateChanged and not \
                self._parent.checkState == 1:
            # inherit from parent
            self._checkState = self._parent.checkState
            self._checkStateChanged = self._parent._checkStateChanged
        else:

def is_excluded_by_user(self, dbx_path):
        """
        Check if file has been excluded from sync by the user.

        :param str dbx_path: Path of folder on Dropbox.
        :return: ``True`` or `False`.
        :rtype: bool
        """
        dbx_path = dbx_path.lower()

        # in excluded files?
        test0 = dbx_path in self.excluded_files
        # in excluded folders?
        test1 = any(dbx_path == f or is_child(dbx_path, f) for f in self.excluded_folders)

        return any((test0, test1))

def _is_deleted_child(x, parent):
        """Check for children of deleted folders"""
        is_deleted_event = (x.event_type is EVENT_TYPE_DELETED)
        return is_deleted_event and is_child(x.src_path, parent.src_path)

def clean_excluded_folder_list(folder_list):
        """Removes all duplicates from the excluded folder list."""

        # remove duplicate entries by creating set, strip trailing "/"
        folder_list = set(f.lower().rstrip(osp.sep) for f in folder_list)

        # remove all children of excluded folders
        clean_folders_list = list(folder_list)
        for folder in folder_list:
            clean_folders_list = [f for f in clean_folders_list if not is_child(f, folder)]

        return clean_folders_list

def _is_moved_child(x, parent):
        """Check for children of moved folders"""
        is_moved_event = (x.event_type is EVENT_TYPE_MOVED)
        return (is_moved_event and
                is_child(x.src_path, parent.src_path) and
                is_child(x.dest_path, parent.dest_path))

self.icon = get_native_folder_icon()
        self._root = root
        self._mdbx = mdbx
        self._async_loader = async_loader

        self._checkStateChanged = False

        # get info from our own excluded list
        excluded_folders = self._mdbx.get_conf("main", "excluded_folders")
        if root.lower() in excluded_folders:
            # item is excluded
            self._originalCheckState = 0
        elif any(is_child(root.lower(), f) for f in excluded_folders):
            # item's parent is excluded
            self._originalCheckState = 0
        elif any(is_child(f, root.lower()) for f in excluded_folders):
            # some of item's children are excluded
            self._originalCheckState = 1
        else:
            # item is fully included
            self._originalCheckState = 2

        # overwrite original state if the parent was modified
        if self._parent and self._parent._checkStateChanged and not \
                self._parent.checkState == 1:
            # inherit from parent
            self._checkState = self._parent.checkState
            self._checkStateChanged = self._parent._checkStateChanged
        else:
            self._checkStateChanged = False
            self._checkState = int(self._originalCheckState)