How to use the pathlib2.__init__.Path function in pathlib2

def __new__(cls, *args, **kwargs):
        if cls is Path:
            cls = WindowsPath if os.name == 'nt' else PosixPath
        self = cls._from_parts(args, init=False)
        if not self._flavour.is_supported:
            raise NotImplementedError("cannot instantiate %r on your system"
                                      % (cls.__name__,))
        self._init()
        return self

def is_mount(self):
        """
        Check if this path is a POSIX mount point
        """
        # Need to exist and be a dir
        if not self.exists() or not self.is_dir():
            return False

        parent = Path(self.parent)
        try:
            parent_dev = parent.stat().st_dev
        except OSError:
            return False

        dev = self.stat().st_dev
        if dev != parent_dev:
            return True
        ino = self.stat().st_ino
        parent_ino = parent.stat().st_ino
        return ino == parent_ino