Respect `gitignore` from above

[vonagam]

Currently only gitignores from cwd and down are taken into account for gitignore filtering. What about those who are higher in a hierarchy?

Use case: monorepo repositories (like babel for example), where gitignore is placed in root and individual packages do not have their own.

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[callumlocke]

Another example is stuff you might have in a global .gitignore, like .DS_Store files or personal conventions like IDEAS.md.

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[sindresorhus]

If anyone wants to work on this, see the initial attempt and feedback in https://github.com/sindresorhus/globby/pull/107. This issue is blocked by https://github.com/mrmlnc/fast-glob/issues/265.

[fisker]

I may have a solution for this, we can find root .git directory, and glob .gitignore from there.