I've installed Resilio Sync on Raspberry Pi and added CIFS shared folder from Apple Airport Extreme to sync. Sync working for few hours and then it stopped.
log:
20170827 14:53:13.236] TF[303B] [0x6591a528][/home/xbian/FamilyLibrary/music/iTunes/iTunes Media/Boards Of Canada/The Campfire Headphase/14 Tears From The Compound Eye.m4a]: unloading torrent by timeout
[20170827 14:53:15.247] TF[303B] [0x65913f38][/home/xbian/FamilyLibrary/music/iTunes/iTunes Media/Dan Barta/Theyories/11 Fool of me.m4a]: unloading torrent by timeout
[20170827 14:53:24.300] TF[303B] [0x65903918][/home/xbian/FamilyLibrary/music/iTunes/iTunes Media/Music/Alfred Schnittke/Concerti grossi 1 & 5, Quasi una sonata/10 Concerto 5_ IV. Lento.m4a]: unloading torrent by timeout
[20170827 14:53:59.458] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:54:09.311] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:54:19.005] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:54:29.528] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:58:52.157] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:58:57.879] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:59:07.881] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:59:17.990] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:59:38.699] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting
[20170827 14:59:39.074] SF[ECC9] [D261]: Got state sync request while processing previous merge, aborting