This article explains how to determine NFS datastore version 3 vs 4.1
VMware ESXi
To check, follow these steps:
1. SSH into ESXi
2. Execute the following command:
・esxcli storage nfs list
* The datastore output from this command is version 3.
・esxcli storage nfs41 list
* The datastore output from this command is version 4.1.