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Windowsfilter folder is filled with image data

I’m running Docker for Windows on Windows 10 Professional. I’ve been pulling, building, running, pushing images like crazy. I have stopped and removed all of my containers and removed all images yet my hard drive is still chock full of image data in the C:\ProgramData\Docker\windowsfilter folder. There is 21 GB of data in the windowsfilter folder. When I browse in it is clearly mostly windowsservercore and nanoserver due to the folder structure and the folder sizes.

Is there anything I can do to tell docker to purge this stuff?

Client:
Version: 1.12.3
API version: 1.24
Go version: go1.6.3
Git commit: 6b644ec
Built: Wed Oct 26 23:26:11 2016
OS/Arch: windows/amd64

Server:
Version: 1.12.3
API version: 1.24
Go version: go1.6.3
Git commit: 6b644ec
Built: Wed Oct 26 23:26:11 2016
OS/Arch: linux/amd64

What’s the output of docker images? Running docker rmi -f <image> should clean things up.

As I think I stated in my original post I didn’t have anything listed when doing docker images.

I managed to get it resolved by using the scary docker-ci-zap.exe utility referenced in this post https://github.com/docker/docker/issues/26873