code: func (m *model) FolderStatistics() map[string]stats.FolderStatistics {
  	res := make(map[string]stats.FolderStatistics)
  	m.fmut.RLock()
  	defer m.fmut.RUnlock()
  	for id, runner := range m.folderRunners {
  		res[id] = runner.GetStatistics()
  	}
  	return res
  }
docs: // FolderStatistics returns statistics about each folder