code: func GetPids(cgroupPath string) ([]int, error) {
  	dir, err := getCgroupPath(cgroupPath)
  	if err != nil {
  		return nil, err
  	}
  	return libcontainercgroups.GetPids(dir)
  }
docs: // GetPids gets pids of the desired cgroup
  // Forked from opencontainers/runc/libcontainer/cgroup/fs.Manager.GetPids()