目前能够实现SMB的2FA的方案主要是针对企业级产品
Announcing General Availability of Server Message Block Protocol Support for Duo Network Gateway
https://duo.com/blog/announcing-ga-smb-support-for-duo-network-gateway
https://duo.com/docs/dng#protect-application-servers-with-duo-network-gateway
需要Premier订阅，每个用户每个月$9美元，最低10用户起，也就是每个月$90美元
