When calling "man lxc.container.conf", an internal "man" keyword is displayed :
$ man lxc.container.conf
[...]
lxc.mount.entry
Specify a mount point corresponding to a line in the fstab format. Moreover lxc supports mount propagation, such as
rslave or rprivate, and adds three additional mount options. optional don't fail if mount does not work. create=dir
or create=file to create dir (or file) when the point will be mounted. relative source path is taken to be relative to
the mounted container root. For instance,