{ ... }: { fileSystems = { "/" = { device = "tmpfs"; fsType = "tmpfs"; options = [ "defaults" "uid=0" "gid=0" "mode=0755" ]; neededForBoot = true; }; "/nix" = { device = "/dev/vg0/system"; fsType = "btrfs"; options = [ "subvol=/@nix" "compress-force=zstd" ]; neededForBoot = true; }; "/persist" = { device = "/dev/vg0/system"; fsType = "btrfs"; options = [ "subvol=/@persist" "compress-force=zstd" ]; neededForBoot = true; }; "/tmp" = { device = "/dev/vg0/system"; fsType = "btrfs"; options = [ "subvol=/@tmp" "compress-force=zstd" "nosuid" "nodev" ]; neededForBoot = true; }; "/mnt/system" = { device = "/dev/vg0/system"; fsType = "btrfs"; options = [ "subvol=/" "compress-force=zstd" ]; }; "/boot" = { device = "/dev/disk/by-partlabel/ESP"; fsType = "vfat"; }; }; }