Comment # 1 on bug 1193642 from Lubos Kocman

Regarding fs layout, it was the default recommended by install

lkocman@localhost:~> sudo btrfs subvolume list /
ID 256 gen 33 top level 5 path @
ID 257 gen 2523 top level 256 path @/var
ID 258 gen 2487 top level 256 path @/usr/local
ID 259 gen 56 top level 256 path @/srv
ID 260 gen 2362 top level 256 path @/root
ID 261 gen 2426 top level 256 path @/opt
ID 262 gen 2523 top level 256 path @/home
ID 263 gen 56 top level 256 path @/boot/writable
ID 264 gen 56 top level 256 path @/boot/grub2/x86_64-efi
ID 265 gen 56 top level 256 path @/boot/grub2/i386-pc
ID 266 gen 2460 top level 256 path @/.snapshots
ID 267 gen 202 top level 266 path @/.snapshots/1/snapshot
ID 268 gen 47 top level 266 path @/.snapshots/2/snapshot
ID 273 gen 213 top level 266 path @/.snapshots/3/snapshot
ID 274 gen 227 top level 266 path @/.snapshots/4/snapshot
ID 276 gen 1133 top level 266 path @/.snapshots/5/snapshot
ID 295 gen 1175 top level 266 path @/.snapshots/6/snapshot
ID 297 gen 2316 top level 266 path @/.snapshots/7/snapshot
ID 301 gen 2019 top level 266 path @/.snapshots/8/snapshot
ID 309 gen 2403 top level 266 path @/.snapshots/9/snapshot
ID 313 gen 2434 top level 266 path @/.snapshots/10/snapshot
ID 315 gen 2438 top level 266 path @/.snapshots/11/snapshot
ID 316 gen 2457 top level 266 path @/.snapshots/12/snapshot