Bafflingly, “Fear(s) of the Dark,” a truly nifty existential animated black-and-white French horror anthology, has been shown only a handful of times in the United States and never had a wide commercial release. Oh what’s that you say? There’s not much of a market for existential animated black-and-white French horror anthologies? Bah! Nevertheless, “Fear(s) of the Dark” contains some genuinely unsettling entries in a variety of animation styles, including tales that involve ghostly samurais and a snarling pack of wild dogs (there is also, true to form, a weird in-between story made up of interviews with people about what they fear, augmented by minimalist animation).