`duf` cannot find all NFSv4 mountpoints

Heya,

I have multiple NFSv4 shares, which are based on ZFS storage.

Recently, I discovered that it is essential to export all nested ZFS datasets to make them visible on an NFS client. For example:

• NFS-server:
  • /mnt/pool/dataset/sub_dataset1
  • /mnt/pool/dataset/sub_dataset2
• exports on NFS server:
  • /mnt/pool/dataset/sub_dataset1
  • /mnt/pool/dataset/sub_dataset2

Only mounting /mnt/pool/dataset/ on the NFS client allows both sub_dataset1 and sub_dataset2 to be mounted successfully. I believe sub_dataset1 and sub_dataset2 should be two separate mountpoints. But duf can only find mnt/pool/dataset/. However, after I manually traversed these two sub-datasets, duf can find them all!