turn off smbv1, that's a big no no and shouldn't be required.
to join the share on a mac it should just be 'smb://serverip/sharedfolder' without the quotes. it's should be pretty straightforward.
things to check: make sure NIC profile hasn't changed from public/domain/private
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make sure network discovery and file/printer sharing is turned on in advanced sharing and in the Local Area Connection adapter
Microsoft Sql For Mac
make sure permissions haven't changed for folder
Microsoft Sql Server Express
edit: smb://serverip/sharedfolder this should be used from the finder utility Connect to Server or Go to Server. I'm forgetting the exact verbage because of using linux lately