For example, let's say you have a directory dir/ with an arbitrary number of subdirectories including dir/subdir/, and you want to mount dir/ to a podman container with every subdirectory also mounted except dir/subdir/.
Is this possible in podman? If so, is it possible to do this purely with the arguments of a podman run command?
Is not possible, the entire folder will be available inside the container.
You can overcome this with permissions, acl or even symbolic links. In the last case, create a second folder with links pointing to only the folders you want to be available inside the container.