Concurrent usage of golang mongo's gridsf driver

Question

I am going to use golang gridfs driver, and here I have statement in docs: "If this download requires a custom read deadline to be set on the bucket, it cannot be done concurrently with other read operations operations on this bucket that also require a custom deadline."

And same for write deadline.

But what will happen if I do? And how should I manage concurrent requests to gridfs? Should forget about timeouts?

I did some research on docs, libs srcs and website but found nothing.