code: func (a *Driver) Status() [][2]string {
  	ids, _ := loadIds(path.Join(a.rootPath(), "layers"))
  	return [][2]string{
  		{"Root Dir", a.rootPath()},
  		{"Backing Filesystem", backingFs},
  		{"Dirs", fmt.Sprintf("%d", len(ids))},
  		{"Dirperm1 Supported", fmt.Sprintf("%v", useDirperm())},
  	}
  }
docs: // Status returns current information about the filesystem such as root directory, number of directories mounted, etc.