return filepath.Join(root, mnt, cgroupPath), nil
	}

	parentPath, err := getCgroupV1ParentPath(mnt, root)
	if err != nil {
		return "", err
	}

	return filepath.Join(parentPath, cgroupPath), nil
}

// getCgroupV1ParentPath gets the parent filepath to this cgroup, for resolving relative cgroup paths.
func getCgroupV1ParentPath(mountpoint, root string) (string, error) {