When adding a CIFS normal share, the default is to display the system files (lost+found, quotas, quotas.grp). To hide the system files, you must use the veto_sys_files CIFS export option.
See About the CIFS export options.
To hide system files when adding a CIFS normal share
CIFS> share add filesystem sharename [cifsoption]
Use the veto_sys_files CIFS export option to hide system files.