Code review comment for ~nexusprism/grub/+git/ubuntu:f2fs-support

You can file a bug if you want that filesystem, and then it can be discussed and handed to security to review if that's something that we decide we want, but this doesn't work for merges.

It seems unlikely that this is something we want, we should try to tighten down what we support further, not add more options. In fact, there probably shouldn't be any options.

These all pose massive security risks.