Any American company will hand over data stored on their server (that they have access to) in response to a warrant.

Apple provides an optional encryption level (ADP) where they don't have a copy of your encryption key.

When Apple doesn't have the encryption key, they can't decrypt your data, so they can't provide a copy of the decrypted data in response to a warrant.

They explain the trade off during device setup: If Apple doesn't have a copy of the key, they can't help you if you should lose your copy of the key.