#!/bin/bash

set -eu

function root_dataset {
    mount | grep 'on / ' | cut -d' ' -f1
}

function find_latest_snapshot_timestamp {
    zfs list -H -t snapshot -r "$(root_dataset)" -o name -S creation \
        | grep @znap | head -n1 | cut -d'@' -f2
}

function list_snapshots {
    local timestamp="$1"
    zfs list -H -t snapshot -o name | grep "$timestamp"
}

list_snapshots "$(find_latest_snapshot_timestamp)"