Hi Dean,
this is currently a limitation of Cells - We are starting a minio server to serve the file using http protocol, and minio is limiting this on mounted folders. We are working on that for direct smb/cifs mount. Or you can try using a docker volume with tool : http://netshare.containx.io/ and mount your smb share directly inside docker. I tested that recently and it was working (minio sees it as an standard folder inside the docker).
Charles