CIFS File system is not working

I am trying to mount CIFS system. Using command line, I can mount filesystem, but using fstab file, its not getting mounted getting. See below error, so please suggest on this:

[4419376.493828] CIFS VFS: cifs_mount failed w/return code = -95

mount -a command is not working:

mount error(95): Operation not supportedRefer to the mount.cifs(8) manual page (e.g. man mount.cifs)