Function isUnderMountPoint

lib/internal/vfs/router.js:15–25

(normalizedPath, mountPoint)

// '/' check would never match. The trailing-separator guard handles root
// mount points like 'C:\' so we don't end up with 'C:\\'.
function isUnderMountPoint(normalizedPath, mountPoint) {
  if (normalizedPath === mountPoint) {
    return true;
  }
  if (mountPoint === '/') {
    return StringPrototypeStartsWith(normalizedPath, '/');
  }
  const prefix = mountPoint[mountPoint.length - 1] === sep ?
    mountPoint : mountPoint + sep;
  return StringPrototypeStartsWith(normalizedPath, prefix);
}

// Returns a POSIX-style relative path the provider can consume. Uses
// `path.relative()` so Windows backslash paths are handled correctly, then