code: func (kl *Kubelet) getPodVolumeSubpathsDir(podUID types.UID) string {
  	return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletVolumeSubpathsDirName)
  }
docs: // getPodVolumesSubpathsDir returns the full path to the per-pod subpaths directory under
  // which subpath volumes are created for the specified pod.  This directory may not
  // exist if the pod does not exist or subpaths are not specified.