Why local samba filesystem not auto mount after system rebooted with error message "CIFS VFS: cifs_mount failed w/return code = -111"

Issue

After system rebooted the samba file system which is exported from localhost cannot auto mount even we have written it in '/etc/fstab' as below.

  //XX.XX.XX.XX(localhost_ip)/sys     /home/data/smb         cifs    username=samba,password=redhat  0 0