Apple has no data to give up. They don't hold the decryption keys, and they've been very careful to construct their system that way.
The government, even with the proper warrants, etc. don't have a right to force Apple to create something that they haven't created (backdoors). If the government could require it, it would be tantamount to forced slavery -- which, granted, the GOP seems to be perfectly ok with, as long as the person being forced to do something is a female, and the reason for which they're being forced to do something is to make a new taxpayer.
I thought they can share your iCloud data with a proper warrant. iCloud data encryption keys are available with Apple.