code: func (m *kubeGenericRuntimeManager) ImageStats() (*kubecontainer.ImageStats, error) {
  	allImages, err := m.imageService.ListImages(nil)
  	if err != nil {
  		klog.Errorf("ListImages failed: %v", err)
  		return nil, err
  	}
  	stats := &kubecontainer.ImageStats{}
  	for _, img := range allImages {
  		stats.TotalStorageBytes += img.Size_
  	}
  	return stats, nil
  }
docs: // ImageStats returns the statistics of the image.
  // Notice that current logic doesn't really work for images which share layers (e.g. docker image),
  // this is a known issue, and we'll address this by getting imagefs stats directly from CRI.
  // TODO: Get imagefs stats directly from CRI.