Feature request: Delete snapshot and all previous snapshots

Snapshot Manager currently provides an option to delete a snapshot together with its subsequent/child snapshots.

Please add the opposite option: "Delete this snapshot and all previous/older snapshots."

This is particularly useful when snapshots are used as a chronological backup history. I normally want to preserve the current state and the most recent snapshots while removing the older history to reclaim disk space.

Deleting older snapshots one by one requires repeated merge operations and can take a considerable amount of time. A single operation that consolidates all snapshots older than a selected point would be much more practical.