Do the Gods Know Fates?

It is quite obvious that fate is out of the hands of the Olympian gods. Neither Athena nor Poseidon can do exactly what they want with Odysseus, as it is not his fate to reach his home easily or not reach it at all. Try as they might, these two gods cannot change Odysseus' fate, which was prophesied by Zeus as being a long but eventually successful journey. We have also seem examples of humans knowing their fate because one of the gods told it to them. The Phaeician king knows that Poseidon told his ancestors that he would one day he would sink a Phaeician ship and put mountains around their port. However, I am not yet sure if the gods know the fates of humans. When Athena pleads with Zeus to let Odysseus free, I did not get the sense that she knew her wish would come true. She does not say that fate says Odysseus' life should now turn to the better, but rather pleads with Zeus to not forget about the man. Since the Olympian gods hold so much power, I find it strange that they don't know the fates of the mortals whose lives they play with, yet know how an entire people's way of life will be destroyed. This may be because Poseidon's threat is something that he knows he can carry out; he knows that he is capable of sinking a Phaeician ship and constructing mountains. Athena may not necessarily know that she will be able to help Odysseus through the maze of Poseidon's anger. However, that would still mean that Poseidon was very determined to kill the Phaeicians in the future or knows what he is going to do, assuming the foreshadowing in the book is what will actually happen. This is all quite confusing, I just thought that I would bring it up.