From the details looks to me snapshot creation controlled by VSS provider which is outside of MSA and must be from some Windows System.
Coming to your query, you need to first change the limit-policy with the help of below command,
set snapshot-space limit-policy delete
You can also refer to CLI guide and page no 247 to check for command "set snapshot-space" to get more details,
https://support.hpe.com/hpsc/doc/public/display?docId=c04957376
You can verify the setting by running below command,
show snapshot-space
Then you can modify the retention priority of snapshots from volume level for each volume with the help of "set volume" command,
https://support.hpe.com/hpsc/doc/public/display?docId=c04957376 (page no 261)
Hope this helps!
Regards
Subhajit
I am an HPE employee
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