Add ability to apply file system directory quotas on share dirs

[phlogistonjohn]

When a share is exposed to samba there may be a need to limit the amount of data to samba. Ideally, this would be done at a layer outside of the samba container. However, there are cases where we are provided a single data volume and shares are directories within that volume. The sambacc library already has the ability to create the share directories and apply permissions to them.

The sambacc json configuration can provide a suggested quota value and parameter indicating kind of file system is in use. Unfortunately, this may be needed because unlike creating directories and applying permissions the tools/calls needed to set a directory or tree quota varies by filesystem. Not all file systems support directory quotas either.