Can files and directories be merge-mounted into a docker container such that changes on the host are immediately visible?

A docker container has these files and directories:

/foo//foo/a.txt/foo/subdir-1//foo/subdir-1/b.txt

The host has these files and directories:

/bar//bar/a.txt/bar/subdir-1//bar/subdir-1/c.txt

I want to mount the host's /bar onto the container's /foo such that the result will be the following in the container:

/foo//foo/a.txt/foo/subdir-1//foo/subdir-1/b.txt/foo/subdir-1/c.txt

such that the container sees the host's version of a.txt, and similarly with other colliding file names. Colliding directories are merged such that the container sees the contents of both.

Furthermore, I want

• if /bar/a.txt or /bar/subdir-1/c.txt are modified on the host, these modifications are immediately visible in the container
• if a new file /bar/subdir-1/d.txt or a new subdirectory /bar/subdir-2 are created in the host while the container is running, the container will also see these appear

The host and container are both Linux.

I tried this in docker-compose:

volumes:   - /bar:/foo

but my container no longer saw b.txt since that file is not present in the host.

Is this effect possible using docker-compose?