Added guest access disabled.

Author: JasonGerend

WindowsServerDocs/storage/file-server/file-server-smb-overview.md

@@ -41,6 +41,7 @@ The following sections describe functionality that was added in SMB 3 and subseq
 
 | Feature/functionality  | New or updated  | Summary  |
 | --------- | --------- | --------- |
+| Guest access to file shares is disabled | New | The SMB client no longer allows the following actions: Guest account access to a remote server; Fallback to the Guest account after invalid credentials are provided. For details, see [Guest access in SMB2 disabled by default in Windows](https://support.microsoft.com/help/4046019/guest-access-in-smb2-disabled-by-default-in-windows-10-and-windows-ser). | 
 | SMB global mapping | New | Maps a remote SMB share to a drive letter that is accessible to all users on the local host, including containers. This is required to enable container I/O on the data volume to traverse the remote mount point. Be aware that when using SMB global mapping for containers, all users on the container host can access the remote share. Any application running on the container host also have access to the mapped remote share. For details, see [Container Storage Support with Cluster Shared Volumes (CSV), Storage Spaces Direct, SMB Global Mapping](https://techcommunity.microsoft.com/t5/failover-clustering/container-storage-support-with-cluster-shared-volumes-csv/ba-p/372140). |
 | SMB dialect control | New | You can now set registry values to control the minimum SMB version (dialect) and maximum SMB version used. For details, see [Controlling SMB Dialects](https://techcommunity.microsoft.com/t5/storage-at-microsoft/controlling-smb-dialects/ba-p/860024). |