code: func IsInitialized(driverHome string) bool {
  	_, err := os.Stat(driverHome)
  	if os.IsNotExist(err) {
  		return false
  	}
  	if err != nil {
  		logrus.Warnf("graphdriver.IsInitialized: stat failed: %v", err)
  	}
  	return !isEmptyDir(driverHome)
  }
docs: // IsInitialized checks if the driver's home-directory exists and is non-empty.