code: func (e *podEnv) newNetLoader() *netLoader {
  	return &netLoader{
  		parent: &netLoader{
  			configPath: path.Join(common.Stage1RootfsPath(e.podRoot), BuiltinNetPath),
  		},
  		configPath: filepath.Join(e.localConfig, UserNetPathSuffix),
  	}
  }
docs: // Build a Loader that looks first for custom (user provided) plugins, then builtin.