Test is to be run locally on TrueNAS server. Syntax is as follows:

"smbtorture //127.0.0.1/zshare -U smbuser%password vfs.shadow_copy_zfs"

returns 0 on success 1 on failure.  On failure, details are printed to stderr.

Setup for test requires the following:

1) Create pool "tank"

2) Create user

3) Create dataset "zshare" , and grant user from (2) full_control to dataset

4) Create SMB share "zshare" with shadow copies enabled. Set auxiliary parameter "shadow:ignore_empty_snaps=false" on share.

Test will create a subdataset tank/zshare/TESTDATASET and will not destroy it.