Result differs from Node's require.resolve when using `basedir` option with symlinks

Hi, Ive noticed an issue that arises when using this package alongside `npm link` or `yarn link` - when resolving from a linked dependency's directory as `basedir`, this package will resolve to a module in the linked packages `node_modules`. This is in contrast to Node's `require.resolve`, which will resolve to the root level `node_modules` (same as if the package wasn't linked).

For example, if `resolve-example` depends on a package `test-pkg`, `test-pkg` itself depends on `lodash`, and I link `resolve-example` to `test-pkg` using `yarn link`, here's what I see after running the following

```
const resolve = require('resolve/sync')
let opts = { basedir: '/Users/jacksonchristoffersen/resolve-example/node_modules/test-pkg', preserveSymlinks: true }

console.log(require.resolve('lodash', opts))
// /Users/jacksonchristoffersen/resolve-example/node_modules/lodash/lodash.js

console.log(resolve('lodash', opts))
// /Users/jacksonchristoffersen/resolve-example/node_modules/test-pkg/node_modules/lodash/lodash.js

opts = { basedir: '/Users/jacksonchristoffersen/resolve-example/node_modules/test-pkg', preserveSymlinks: false }

console.log(require.resolve('lodash', opts))
// /Users/jacksonchristoffersen/resolve-example/node_modules/lodash/lodash.js

console.log(resolve('lodash', opts))
// /Users/jacksonchristoffersen/test-pkg/node_modules/lodash/lodash.js
```

I'd expect these results to match for each value of `opts`