The 2 first chars are removed, without testing this was // or \\. Here is a patch to add this check. Could not find a component for utils, please reaffect this bug to the right one...
Created attachment 947 [details] Patch to check in smbc{acls,quotas} that the path begins by //
Created attachment 949 [details] Patch to check in smbc{acls,quotas} that the path begins by // Sorry, uploaded unsplitted patch