How to hide the output from cset shield?

[fadhilkurnia]

When running a program inside the shield, I get this kind of output:

cset: --> last message, executed args into cpuset "/user", new pid is: 14669

Is there any option to hide that output?
I want to hide that specific output, but not the output from the program that runs inside the shield.

Thanks

[Werkov]

The setup code and program proper share the same file descriptors (namely stdout), so I don't see an obvious way how to split their outputs.
However, the reported message could be downgraded to debug (I mean it'd be acceptable change to the code).

[Werkov]

Cross-link to a popular demand, #39.