1. A filter comprising:a first member having a first surface provided with a plurality of grooves; and
a second member set with a second surface thereof covering the plurality of grooves,
the first member including a first passable portion that allows a fluid to pass between the first surface and a first space, which is defined beside a surface of the first member opposite to the first surface, through a first area of the plurality of grooves,
the second member including a second passable portion that allows the fluid to pass between the second surface and a second space, which is defined beside a surface of the second member opposite to the second surface, through a second area of the plurality of grooves distanced from the first area,
wherein the first member is made of a material selected from molybdenum, tungsten, aluminum oxide, silicon dioxide glass, silicon carbide, tungsten carbide, aluminum nitride, zirconium boride, and boron carbide, and
wherein the second member exposes a part of the plurality of grooves therethrough to the second space.