Who were the directors of the episode "nano nits" written by nathan cockerill?
CREATE TABLE "table1_23170118_2" (
  "episode_number" text,
  "title" text,
  "villains" text,
  "director" text,
  "writer" text,
  "original_airdate" text
);
SELECT "director" FROM "table1_23170118_2" WHERE "writer"='Nathan Cockerill' AND "title"='\"Nano Nits\"';