code: func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) string {
  	pcm := kl.containerManager.NewPodContainerManager()
  	_, cgroupParent := pcm.GetPodContainerName(pod)
  	return cgroupParent
  }
docs: // GetPodCgroupParent gets pod cgroup parent from container manager.