Function foreach

src/linux/fs.cpp:201–207

    hashmap<int, vector<MountInfoTable::Entry>> parentToChildren;

    foreach (const MountInfoTable::Entry& entry, table.entries) {
      if (entry.target == "/") {
        CHECK_NONE(rootParentId);
        rootParentId = entry.parent;
      }
      parentToChildren[entry.parent].push_back(entry);
    }

    // Walk the hashmap and construct a list of entries sorted
    // hierarchically. The recursion eventually terminates because