Gulp.src does not consider base directory

I have following stucture of the project:

- _build/
- build-tools/
  - gulpfile.js
- someFolder/
- excludeFolder/
- index.html

I want to copy all the files except _build and 'excludeFolder' dir to the _build/release directory.

I am using this gulp task:

gulp.src(['*',
          '!_build/**/*',
          '!build-tools/**/*',
          '!excludeFolder/**/*'],{base:'..'})
        .pipe(gulp.dest('_build/release'));

How can I command Gulp to start relative path from upper root directory, or any other directory that the gulfile.js is located?