How to use the paperwork-backend.paperwork_backend.fs.GioFileSystem function in paperwork-backend

def __init__(self):
        self.fs = fs.GioFileSystem()

def __init__(self):
        self.fs = GioFileSystem()

        self.indexdir = None
        self.index = None
        self.label_guesser_dir = None
        self._docs_by_id = {}  # docid --> doc
        self.labels = {}  # label name --> label
        self.__searcher = None
        self.label_guesser = None
        self.search_param_list = {}
        self.label_guesser = None
        self.rootdir = None
        self.opened = False
        self.running = True

        self.reload_index_data = {}
        self.examine_rootdir_data = {}