Fields common to files, directories, and symlinks:

{"camliVersion": 1,
 "camliType": "...",  // one of "file", "directory", "symlink"

  // Exactly one of these is required:
  "fileName": "if-it-is-utf8.txt",    // only for utf-8
  "fileNameBytes": [65, 234, 234, 192, 23, 123],   // if unknown charset (not recommended)

  // Optional:
  "unixPermission": "0755",  // no octal in JSON, so octal as string
  "unixOwnerId": 1000,
  "unixOwner": "bradfitz",
  "unixGroupId": 500,
  "unixGroup": "camliteam",
  "unixXattrs": [....],  // TBD
  "unixMtime": "2010-07-10T17:14:51.5678Z",  // UTC-- ISO 8601, as many significant digits as known
  "unixCtime": "2010-07-10T17:20:03.9212Z",  // UTC-- ISO 8601, best-effort to match unix meaning

  // Not recommended to include, but if you must: (atime is a bit silly)
  "unixAtime": "2010-07-10T17:14:22.1234Z",  // UTC-- ISO 8601
}