[Observium] Monitoring an NFS share?

We have our backup storage mounted as an NFS share on our devices. We want to monitor each of these shares individually from the servers themselves (Not from the backup server, as that machine is not under our control).

I am loving Observium so far but cannot figure out how we can accomplish this task. Disk monitoring is already in place so this doesn't seem like too much of a reach as the mounted share shows up in df -h output.

Any tips would be appreciated.