There isn't a specific reference to training requirements that I can think of off the top of my head. Instead there are comments like "staff need to know" and "management must be informed" and "the bank must comply" which follow many of the regulatory statements. I'm not sure how your staff are going to "know" for instance, where the file is if you don't train them at some point? Also they're supposed to know if there is a branch file, and higher level management needs to know about Sunshine, etc., which means, training.
All customer contact staff need to know where the files are and how to notify the CRA office if someone wants to see the public file. All management covered under Sunshine need to know what their responsabilities are in regards to reporting so that you don't fall out of compliance in that regard, but does Proof need to know about Sunshine? No of course not. Most of us don't train our "non-contact" folks on CRA. I think generally training for most branch staff takes place annually because you don't want them to forget what they need to be aware of, and then many train boards every two years or so on pertinent information.
Training is not part of the exam though. I've never been asked for the information, but if the examiner wanders into the branch and can't get to the file, you'll find it will come up. Same if a community group can't get the information because they hit an untrained teller. At that point, you'll be out of compliance and subject to a complaint