code: def __init__(
      self,
      fs: FileSystem,
      root_dirs: List[str],
      level: StorageLevel,
      size: int,
  ):
      self._fs = AioFilesystem(fs)
      self._root_dirs = root_dirs
      self._level = level
      self._size = size
  
file_path: mars/mars/storage/filesystem.py
imports: import os
  import uuid
  from typing import Dict, List, Optional, Tuple
  from ..lib.aio import AioFilesystem
  from ..lib.filesystem import FileSystem, get_fs
  from ..serialization import AioSerializer, AioDeserializer
  from ..utils import mod_hash, implements
  from .base import StorageBackend, ObjectInfo, StorageLevel, register_storage_backend
  from .core import StorageFileObject
label_desc: Use image node_id 1 to create a new FileSystemStorage object from inherited base classes: StorageBackend with example: obj = FileSystemStorage(fs, root_dirs, level, size)