I see these when performing a capture with ESXTOP, but I don't think they are exposed in the vSphere client. You may want to increase the vSphere stats collection to the maximum and see if they are exposed.
Physical Disk NFS Volume\Aborts/sec
Physical Disk NFS Volume\Active Commands
Physical Disk NFS Volume\Average Guest MilliSec/Command
Physical Disk NFS Volume\Average Guest MilliSec/Read
Physical Disk NFS Volume\Average Guest MilliSec/Write
Physical Disk NFS Volume\Commands/sec
Physical Disk NFS Volume\Failed Commands/sec
Physical Disk NFS Volume\Failed MBytes Read/sec
Physical Disk NFS Volume\Failed MBytes Written/sec
Physical Disk NFS Volume\Failed Reads/sec
Physical Disk NFS Volume\Failed Reserves/sec
Physical Disk NFS Volume\Failed Writes/sec
Physical Disk NFS Volume\MBytes Read/sec
Physical Disk NFS Volume\MBytes Written/sec
Physical Disk NFS Volume\Reads/sec
Physical Disk NFS Volume\Resets/sec
Physical Disk NFS Volume\Writes/sec