code: func (m *model) StartFolder(folder string) {
  	m.fmut.Lock()
  	defer m.fmut.Unlock()
  	folderCfg := m.folderCfgs[folder]
  	m.startFolderLocked(folderCfg)
  
  	l.Infof("Ready to synchronize %s (%s)", folderCfg.Description(), folderCfg.Type)
  }
docs: // StartFolder constructs the folder service and starts it.