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The macOS CLI utility smbutil can provide useful information about what features are available and enabled on SMB-mounted file shares. The following command displays information about mounted SMB shares and their supported features:
smbutil statshares -a
Running this command helps administrators verify that edits made to /etc/nsmb.conf have taken effect. It shows information about the SMB that is not available elsewhere in macOS.
The following shows sample output of this command on a macOS 11 system while connecting to a PowerScale cluster running OneFS 9.4. Apple Extensions have been disabled on the PowerScale cluster, and the macOS client has been forced to use SMB3.