I have several servers that use windows mount path, that it doesn;t have a drive letter. i followed the steps described in 

https://support.zoho.com/portal/manageengine/helpcenter/articles/monitoring-windows-volume-mount-points-using-opmanager

       it does discovered all the mount path but it report incorrect free space, used space, utilization. Even when i ran a report, see my screenshot attached,