A similiar thread is here. http://community.netapp.com/t5/Network-Storage-Protocols-Discussions/Windows-10-unable-to-access-CIFS/m-p/108185#U108185
Seems like a workaround by setting some registry parameters resolves this issue. Please see if this helps.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters]
"EnablePlainTextPassword"=dword:00000000
"EnableSecuritySignature"=dword:00000001
"RequireSecuritySignature"=dword:00000001
"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
77,00,6b,00,73,00,73,00,76,00,63,00,2e,00,64,00,6c,00,6c,00,00,00
"ServiceDllUnloadOnStop"=dword:00000001
"OtherDomains"=hex(7):00,00
"AllowInsecureGuestAuth"=dword:00000001