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Currently, `restic backup` (if a `--parent` is not provided) will choose the most recent matching snapshot as the parent snapshot. This makes sense in the usual case, where we tag the snapshot-being-created with the current time. However, this doesn't make sense if the user has passed `--time` and is currently creating a snapshot older than the latest snapshot. Instead, choose the most recent snapshot which is not newer than the snapshot-being-created's timestamp, to avoid any time travel. Impetus for this change: I'm using restic for the first time! I have a number of existing BTRFS snapshots I am backing up via restic to serve as my initial set of backups. I initially `restic backup`'d the most recent snapshot to test, then started backing up each of the other snapshots. I noticed in `restic cat snapshot <id>` output that all the remaining snapshots have the most recent as the parent.