The showmount commands shows the contents of the rmtab file. In theory, when something is unmounted, the entry should be removed, but it isn't guaranteed and you end up having the stale entries. I don't think there is a way to clean that up - except likely by rebooting or restarting the NFS service. You might be able to manually remove the entries from the file, depending on the version of data ontap, but there would be a concern that the NFS service may get a bit messed up if things were removed that shouldn't have been.
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