What's the Ontap version (Where file share exists)? What's the Windows client version (i.e Accessing share from)?
Also, output of this please: filer> options cifs.smb2.enable
In general: "The requesting client and storage controller negotiate the protocol version based on what protocol versions are supported on each and on what version the clients present during protocol negotiation".
The version of SMB used between a client and the server will be the highest dialect supported by both the client and server.
7-mode: Can only do SMB1,2/2_1.
Try this option: -Open Control Panel. -Click on Programs. -Click on Turn Windows features on or off link. -Expand the SMB 1.0/CIFS File Sharing Support option. -Check the SMB 1.0/CIFS Client option. -Click the OK button. - Click the Restart now button.