code: func ParallelRecovery(count int) FileStoreOption {
  	return func(o *FileStoreOptions) error {
  		if count <= 0 {
  			return fmt.Errorf("parallel recovery value must be at least 1")
  		}
  		o.ParallelRecovery = count
  		return nil
  	}
  }
docs: // ParallelRecovery is a FileStore option that allows the parallel
  // recovery of channels. When running with SSDs, try to use a higher
  // value than the default number of 1. When running with HDDs,
  // performance may be better if it stays at 1.