How to use the gcovr.utils.DirectoryPrefixFilter function in gcovr

#
    # Setup filters
    #

    # The root filter isn't technically a filter,
    # but is used to turn absolute paths into relative paths
    options.root_filter = re.compile(re.escape(options.root_dir + os.sep))

    if options.exclude_dirs is not None:
        options.exclude_dirs = [
            f.build_filter(logger) for f in options.exclude_dirs]

    options.exclude = [f.build_filter(logger) for f in options.exclude]
    options.filter = [f.build_filter(logger) for f in options.filter]
    if not options.filter:
        options.filter = [DirectoryPrefixFilter(options.root_dir)]

    options.gcov_exclude = [
        f.build_filter(logger) for f in options.gcov_exclude]
    options.gcov_filter = [f.build_filter(logger) for f in options.gcov_filter]
    if not options.gcov_filter:
        options.gcov_filter = [AlwaysMatchFilter()]

    # Output the filters for debugging
    for name, filters in [
        ('--root', [options.root_filter]),
        ('--filter', options.filter),
        ('--exclude', options.exclude),
        ('--gcov-filter', options.gcov_filter),
        ('--gcov-exclude', options.gcov_exclude),
        ('--exclude-directories', options.exclude_dirs),
    ]:

def match(self, path):
        normpath = os.path.normpath(path)
        return super(DirectoryPrefixFilter, self).match(normpath)