Documentation missing for new "per-volume mount propagation mode" feature

[JonathonReinhart]

PR #17034 Added the capability to specify per volume mount propagation mode. This added the shared/slave/private options to the --volume option.

As was mentioned in #17034 (comment), the documentation for this was supposed to be updated in a follow-up PR, but that doesn't seem to have happened.

Places where it is missing or completely underwhelming:

• https://docs.docker.com/engine/reference/run/
• https://docs.docker.com/engine/reference/commandline/run/
• https://docs.docker.com/engine/userguide/containers/dockervolumes/

Just Ctrl+F for the word "slave" on those pages, and see that it is missing, or has no explanation.

This was originally brought up in #20555.

cc @thaJeztah

[thaJeztah]

ping @moxiegirl (per #17034 (comment)) 😇

Thanks for opening @JonathonReinhart !

[BDuelz]

I've searched, but I haven't found any in-depth docs. Just wondering if this is still being worked on.

[Hronom]

Same, any progress on this?

[alex-dr]

Ditto.

man docker run will tell you what you need to know, for anyone who finds this.