code: func (d *driver) Stat(ctx context.Context, subPath string) (storagedriver.FileInfo, error) {
  	fullPath := d.fullPath(subPath)
  
  	fi, err := os.Stat(fullPath)
  	if err != nil {
  		if os.IsNotExist(err) {
  			return nil, storagedriver.PathNotFoundError{Path: subPath}
  		}
  
  		return nil, err
  	}
  
  	return fileInfo{
  		path:     subPath,
  		FileInfo: fi,
  	}, nil
  }
docs: // Stat retrieves the FileInfo for the given path, including the current size
  // in bytes and the creation time.