High Sierra and local TimeMachine backups

I was wondering where some of my disk space was going, and realized that macOS HighSierra will make local TimeMachine backups as needed, and while disk space is available. This might be cool in some cases, and you can see (and delete) these snapshots with 

$ tmutil listlocalsnapshotdates /Volumes/com.apple.TimeMachine.localsnapshots

$ tmutil deletelocalsnapshots 2017-11-29-134430

Another alternative is to use the thinlocalsnapshots option

$ tmutil thinlocalsnapshots /Volumes/com.apple.TimeMachine.localsnapshots

However, that didn't do anything on my box. Instead, I just looped over all of the snapshots, and nuked them all:

for snap in $(tmutil listlocalsnapshotdates /Volumes/com.apple.TimeMachine.localsnapshots); do
    tmutil deletelocalsnapshots $snap