Vcs Trigger Rules on snapshot dependencies

Hi all, 

I'm trying to figure out a problem with VCS Trigger Rules and snapshot dependencies

Here my scenario

Build_A
Vcs Trigger Rules +:/MyFolderA/**

Build_B
Vcs Trigger Rules +:/MyFolderB/**

Build_C
Vcs Trigger Rules +:/MyFolderC/**

Snapshot Dependencies

Build_A => Build_B => Build_C

Pushing changes on path:

• MyFolderA: trigger Build_A only
• MyFolderB: snapshot dependency to Build_A, trigger Build_A only if also MyFolderA has changes, trigger Build_B
• MyFolderC: snapshot dependency to Build_A, trigger Build_A only if also MyFolderA has changes, snapshot dependency to Build_B, trigger Build_B only if also MyFolderB has changes, trigger Build_C

How can I configure snapshot dependencies and VCS Trigger rules?

Thank you!

Regards