Fix Share::getUsersSharingFile() for mount points
Fix Share::getUsersSharingFile() for mount points

xx621998xx/server,owncloud/core,IljaN/core,cernbox/core,phil-davis/core,whitekiba/server,bluelml/core,Ardinis/server,owncloud/core,pixelipo/server,endsguy/server,IljaN/core,Ardinis/server,pollopolea/core,pollopolea/core,sharidas/core,andreas-p/nextcloud-server,jbicha/server,michaelletzgus/nextcloud-server,cernbox/core,nextcloud/server,endsguy/server,pollopolea/core,michaelletzgus/nextcloud-server,pmattern/server,Ardinis/server,pmattern/server,IljaN/core,bluelml/core,bluelml/core,jbicha/server,pollopolea/core,Ardinis/server,andreas-p/nextcloud-server,jbicha/server,IljaN/core,endsguy/server,jbicha/server,nextcloud/server,pixelipo/server,sharidas/core,endsguy/server,xx621998xx/server,nextcloud/server,pollopolea/core,bluelml/core,xx621998xx/server,xx621998xx/server,whitekiba/server,sharidas/core,bluelml/core,whitekiba/server,pixelipo/server,michaelletzgus/nextcloud-server,andreas-p/nextcloud-server,cernbox/core,andreas-p/nextcloud-server,pmattern/server,nextcloud/server,pixelipo/server,whitekiba/server,andreas-p/nextcloud-server,owncloud/core,owncloud/core,owncloud/core,cernbox/core,jbicha/server,whitekiba/server,sharidas/core,michaelletzgus/nextcloud-server,IljaN/core,pmattern/server,Ardinis/server,pixelipo/server,cernbox/core,endsguy/server,sharidas/core,xx621998xx/server,pmattern/server