code: func NewFSMetadataStore(basePath string) (*FSMetadataStore, error) {
  	if err := os.MkdirAll(basePath, 0700); err != nil {
  		return nil, err
  	}
  	return &FSMetadataStore{
  		basePath: basePath,
  	}, nil
  }
docs: // NewFSMetadataStore creates a new filesystem-based metadata store.