code: func DiskUsage(path string) (*resource.Quantity, error) {
  	_, _, usage, _, _, _, err := FsInfo(path)
  	if err != nil {
  		return nil, err
  	}
  
  	used, err := resource.ParseQuantity(fmt.Sprintf("%d", usage))
  	if err != nil {
  		return nil, fmt.Errorf("failed to parse fs usage %d due to %v", usage, err)
  	}
  	used.Format = resource.BinarySI
  	return &used, nil
  }
docs: // DiskUsage gets disk usage of specified path.