This is not possible at the EXT4 filesystem level. You may be able to do it using SELinux or Apparmour.
Something else to look into would be "jails" - Unix has a concept of limiting the root of the filesystem to a given subdirectory - if you are able to run torque in an appropriately configured jail that might do the trick - but I've not come across this software before today, so I don't know if that can be done or is appropriate.