Safely deleting old images from previous user namespace

General Discussions
1

I used this guide to change docker user from root to me, see this: https://www.pugetsystems.com/labs/hpc/Docker-and-NVIDIA-docker-on-your-workstation-Setup-User-Namespaces-906/

However, I had many images which are now not seen by docker, which take up 115GB of space. It appears they reside in
/var/lib/docker/aufs
The new images I believe are now in /var/lib/docker/1000.1000/aufs

Is it safe to delete the previous aufs folder or am I asking for trouble?
Or can I move over the previous images and change their ownership?

fwiw I renamed aufs to aufs-bak and docker seems to work

Thanks

EDIT: specs
Client:
Version: 17.04.0-ce
API version: 1.28
Go version: go1.7.5
Git commit: 4845c56
Built: Mon Apr 3 18:07:42 2017
OS/Arch: linux/amd64

Server:
Version: 17.04.0-ce
API version: 1.28 (minimum version 1.12)
Go version: go1.7.5
Git commit: 4845c56
Built: Mon Apr 3 18:07:42 2017
OS/Arch: linux/amd64
Experimental: false

2

For those who will google in the future. I deleted the old folder, it caused no problems.
I may have given myself other problems ie. X11 issues… but anyways, there it is.