code: func (p *Pod) Stage1RootfsPath() (string, error) {
  	stage1RootfsPath := "stage1/rootfs"
  	if p.UsesOverlay() {
  		stage1TreeStoreID, err := p.GetStage1TreeStoreID()
  		if err != nil {
  			return "", err
  		}
  		stage1RootfsPath = fmt.Sprintf("overlay/%s/upper/", stage1TreeStoreID)
  	}
  
  	return filepath.Join(p.Path(), stage1RootfsPath), nil
  }
docs: // Stage1RootfsPath returns the stage1 path of the pod.