Giving the following scenario:

1. Samba server used for some time *without* any of the streams modules and with macOS clients.

2. When macOS clients create files on the server, the macOS internal APIs will create AppleDouble files (._FILE) on the server.

3. These AppleDouble contain the following marshalled data, some of it optional:
   a) FinderInfo (mandatory, fixed size 32 bytes)
   b) Extended Attributes (optional, variable size, if present part of FinderInfo)
   c) Resource Fork (optional, variable size)

4. vfs_fruit is enabled on the server

5. vfs_fruit has a conversion routing to migrate the above data from the AppleDouble file to the stream backend, unfortunately 3a is tied to 3b, that is FinderInfo only gets migrated if the AppleDouble file only contains xattr data. As the latter is only optional, for many AppleDouble files we fail to convert correctly.