Folding: `zx` for updating folds/collapsing all other folds

Is your feature request related to a problem? Please describe.
I would often like to collapse all folds except for the one at the cursor position.

Describe the solution you'd like
From :help folding in vim: "It may happen that folds are not updated properly. You can use zx or zX to force updating folds."

The effect of this is to collapse all folds that the cursor position is not a part of.
E.g.,

int main(int argc, char *argv[])
{
  if (argc > 1)
  {
    std::cout << argc << std::endl; // <- cursor position
    if (argc > 2)
    {
      call_some_function();
    }
  }
  if (argc > 1)
  {
    std::cout << argc << std::endl;
    if (argc > 2)
    {
      call_some_function();
    }
  }
  return 0;
}

would collapse to

int main(int argc, char *argv[])
{
  if (argc > 1)
  {
    std::cout << argc << std::endl; // <- cursor position
    if (argc > 2)
+----  3 lines: {················································································
  }
  if (argc > 1)
+---  7 lines: {·················································································
  return 0;
}

Describe alternatives you've considered

• Using ctrl-k ctrl-1 through ctrl-k ctrl-7 approximates this up to a limit, but involves 14 keystrokes and stops at fold level 7.
• Using zM then <line number>G and <column number>| essentially performs the desired operation, but involves 6-10 keystrokes on average and requires remembering the line and column numbers of the cursor position.

Start by comparing the requested zx behavior with the existing Ctrl-K fold commands and zM behavior in VSCodeVim. Implement folding that preserves the cursor's containing folds while collapsing others, then verify it against the C++ example and the stated alternatives.