code: func (cli *Client) ContainerDiff(ctx context.Context, containerID string) ([]container.ContainerChangeResponseItem, error) {
  	var changes []container.ContainerChangeResponseItem
  
  	serverResp, err := cli.get(ctx, "/containers/"+containerID+"/changes", url.Values{}, nil)
  	defer ensureReaderClosed(serverResp)
  	if err != nil {
  		return changes, err
  	}
  
  	err = json.NewDecoder(serverResp.body).Decode(&changes)
  	return changes, err
  }
docs: // ContainerDiff shows differences in a container filesystem since it was started.