code: func (vm *volumeManager) verifyVolumesMountedFunc(podName types.UniquePodName, expectedVolumes []string) wait.ConditionFunc {
  	return func() (done bool, err error) {
  		return len(vm.getUnmountedVolumes(podName, expectedVolumes)) == 0, nil
  	}
  }
docs: // verifyVolumesMountedFunc returns a method that returns true when all expected
  // volumes are mounted.