On April 11th 2017 Microsoft release a CU update for Windows Server 2016, Since the release I’ve tested the build and I’m happy with it.
If you are a Nano Server Admin or just a fan, I suggest you give it a go and test it.
Below, you will see the update that Is available, Package size Is 1094MB
After the update my Nano Server 2016 comes up with a new build number
Before 14393.953.amd64fre.rs1_release_sec.170303-1614
After 14393.1066.amd64fre.rs1_release_sec.170327-1835
To update Windows Nano Server 2016 visit How To Update Windows Nano Server 2016