locktest(1) on Linux
The text 25720ca767f6, as Debian 8 (Jessie) shipped it.
Find differences in locking between two SMB servers
Flags it lists
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-A -
-B -
-E -
-M -
-O -
-R -
-U -
-Z -
-a -
-k -
-o -
-s -
-u