Just before Christmas a new KB was released with the latest available File Server hotfixes for Windows 2012/2012 R2 and 8/8.1 and introduced register keys
Including fixes for ntfs.sys, srvnet.sys, srvsvc.dll, srv2.sys, mrxsmb.sys, mrxsmb20.sys, rbdss.sys,
http://support.microsoft.com/kb/2899011
Looking for the same for Windows 2008/2008R2? Have a look at this place: http://support.microsoft.com/kb/2473205