[seminatl]

Yeah the title should be "unionfs: a kernel feature having nothing whatever to do with containers, and some ways to use it" but I guess that's too long :-) . Problem is there is not some central marketing department for Linux that can even tell us what "containers" means. There are lots of people who think they are "using containers" who do not use this style of mount, and there are lots of people using this style of mount who do not consider themselves container users.