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We propose a translationally invariant metamirror for light filtering in reflection. The device consists of athin transverse grating in the micron scale positioned in front of a flat mirror. We analyze the performance ofsuch a photonic metamirror and find a modification of the angular spectrum of the reflected beams, leading toa significant reduction of the beam divergence for particular configurations. This study points toward a typeof optical component, a flat metamirror with a filtering functionality and no alignment requirements, due to itstranslational invariance. ; The authors acknowledge financial support from the YoungScholar Fellowship Program by the Ministry of Science andTechnology (MOST) in Taiwan, under Grant No. MOST108-2636-M-027-002, also from NATO SPS research Grant No.985048. K.S. acknowledges funding from European Social Fund (Project No. 09.3.3-LMT-K712-17-0016) under a grant agreement with the Research Council of Lithuania (LMTLT).K.S., R.H., and M.B. also acknowledge support by Spanish Ministerio de Ciencia e Innovación y European Union FEDER through Project No. PID2019-109175GB-C21. ; Peer Reviewed ; Postprint (author's final draft)