code: func (p *criStatsProvider) getFsInfo(fsID *runtimeapi.FilesystemIdentifier) *cadvisorapiv2.FsInfo {
  	if fsID == nil {
  		klog.V(2).Infof("Failed to get filesystem info: fsID is nil.")
  		return nil
  	}
  	mountpoint := fsID.GetMountpoint()
  	fsInfo, err := p.cadvisor.GetDirFsInfo(mountpoint)
  	if err != nil {
  		msg := fmt.Sprintf("Failed to get the info of the filesystem with mountpoint %q: %v.", mountpoint, err)
  		if err == cadvisorfs.ErrNoSuchDevice {
  			klog.V(2).Info(msg)
  		} else {
  			klog.Error(msg)
  		}
  		return nil
  	}
  	return &fsInfo
  }
docs: // getFsInfo returns the information of the filesystem with the specified
  // fsID. If any error occurs, this function logs the error and returns
  // nil.