code: func FnAttach(client *docker.Client, containerID string, stdin io.Reader, stdout io.Writer, stderr io.Writer) (w docker.CloseWaiter, err error) {
  	return client.AttachToContainerNonBlocking(docker.AttachToContainerOptions{
  		Container:    containerID,
  		RawTerminal:  true,
  		Stream:       true,
  		Stdin:        true,
  		Stderr:       true,
  		Stdout:       true,
  		Logs:         true,
  		InputStream:  stdin,
  		ErrorStream:  stderr,
  		OutputStream: stdout,
  	})
  }
docs: //FnAttach attach into a running container