How to use the pyfuse3.init function in pyfuse3

def main():
    logging.basicConfig()
    args = parse_args()
    if args.debug:
        logging.getLogger().setLevel(logging.DEBUG)

    argv = args.argv_prefix if args.argv_prefix else ("bash", "-c")
    operations = BashFS(argv_prefix=argv, separator=args.separator.encode())

    fuse_options = set(pyfuse3.default_options)
    fuse_options.add("fsname=bashfs")
    fuse_options.discard("default_permissions")
    if args.debug_fuse:
        fuse_options.add("debug")
    pyfuse3.init(operations, args.mountpoint, fuse_options)

    try:
        trio.run(pyfuse3.main)
    except:
        pyfuse3.close(unmount=True)
        raise

    pyfuse3.close()

metadata_upload_task = MetadataUploadTask(backend_pool, param, db,
                                              options.metadata_upload_interval)
    block_cache = BlockCache(backend_pool, db, cachepath + '-cache',
                             options.cachesize * 1024, options.max_cache_entries)
    commit_task = CommitTask(block_cache)
    operations = fs.Operations(block_cache, db, max_obj_size=param['max_obj_size'],
                               inode_cache=InodeCache(db, param['inode_gen']),
                               upload_event=metadata_upload_task.event)
    block_cache.fs = operations
    metadata_upload_task.fs = operations

    async with trio.open_nursery() as nursery:
      with ExitStack() as cm:
        log.info('Mounting %s at %s...', options.storage_url, options.mountpoint)
        try:
            pyfuse3.init(operations, options.mountpoint, get_fuse_opts(options))
        except RuntimeError as exc:
            raise QuietError(str(exc), exitcode=39)

        unmount_clean = False
        def unmount():
            log.info("Unmounting file system...")
            pyfuse3.close(unmount=unmount_clean)
        cm.callback(unmount)

        if options.fg or options.systemd:
            faulthandler.enable()
            faulthandler.register(signal.SIGUSR1)
        else:
            if stdout_log_handler:
                logging.getLogger().removeHandler(stdout_log_handler)
            crit_log_fd = os.open(os.path.join(options.cachedir, 'mount.s3ql_crit.log'),