code: func (d *stiDocker) GetImageUser(name string) (string, error) {
  	name = getImageName(name)
  	resp, err := d.InspectImage(name)
  	if err != nil {
  		glog.V(4).Infof("error inspecting image %s: %v", name, err)
  		return "", s2ierr.NewInspectImageError(name, err)
  	}
  	user := resp.Config.User
  	return user, nil
  }
docs: // GetImageUser finds and retrieves the user associated with
  // an image if one has been specified