I recently rebuilt my NAS machine using Arch Linux. When I got things going again my ESXi machine would not mount the NFS exports using the VSphere Client application. I managed to get the share mounted but only by using the esxcli commands.
Seems that NFS 4.1 is supported by ESXi 6.x and later but only using the full VSphere client or the cli commands.
esxcli storage nfs41 add -H=10.2.2.232 --readonly --share=/media