def filesys_decode(path):
    """
    Ensure that the given path is decoded,
    NONE when no expected encoding works
    """

    if isinstance(path, six.text_type):
        return path

    fs_enc = sys.getfilesystemencoding() or 'utf-8'
    candidates = fs_enc, 'utf-8'

    for enc in candidates:
        try:
            return path.decode(enc)
        except UnicodeDecodeError:
            continue