github.com/rootless-containers/rootlesskit/v2@v2.3.4/docs/mount.md (about)

     1  ## Mount Propagation
     2  
     3  The mount namespace created by RootlessKit has `rprivate` propagation by default.
     4  
     5  Starting with v0.9.0, the propagation can be set to `rslave` by specifying `--propagation=rslave`.
     6  
     7  The propagation can be also set to `rshared`, but known not to work with `--copy-up`.
     8  
     9  Note that `rslave` and `rshared` do not work as expected when the host root filesystem isn't mounted with "shared".
    10  (Use `findmnt -n -l -o propagation /` to inspect the current mount flag.)