NixOS/hosts/luna/os/filesystem.nix

{ config, lib, pkgs, modulesPath, ... }:
{
  fileSystems = {
    "/" = {
      device = "none";
      fsType = "tmpfs";
      options = [ "defaults" "noatime" "mode=755" ];
    };

    "/boot" = {
      device = "/dev/disk/by-label/NixOS-Boot";
      fsType = "vfat";
      options = [ "defaults" "noatime" ];
      depends = [ "/" ];
    };

    "/nix" = {
      device = "/dev/disk/by-label/NixOS-Primary";
      fsType = "btrfs";
      options = [ "subvol=@nix" "compress=zstd" "noatime" ];
    };
  };

  zramSwap.enable = true;
}