Create a new automator application that has a single action of 'Run Shell Script' and add this as the script, replacing 'MOUNTNAME' with what you want the network share mounted as, 'USERNAME' and 'PASSWORD' respectively (if you have neither set on your SMB share [seriously?] remove from 'USERNAME' to '@' from that line), 'HOST/PATH/TO/TIMEMACHIN…

Time Machine SMB mount via Automator

mkdir /Volumes/MOUNTNAME; mount_smbfs //USERNAME:PASSWORD@HOST/PATH/TO/TIMEMACHINE/SPARSEBUNDLE /Volumes/MOUNTNAME; /usr/bin/hdiutil attach /Volumes/MOUNTNAME/YOURTIMEMACHINE.sparsebundle;