code: func (c *ClaimTreeClient) Get(ctx context.Context, orgID *identity.ID,
  	ownerID *identity.ID) (*ClaimTree, error) {
  
  	if orgID == nil {
  		return nil, errors.New("An org id must be provided")
  	}
  
  	cts, err := c.List(ctx, orgID, ownerID)
  	if err != nil {
  		return nil, err
  	}
  
  	if len(cts) != 1 {
  		return nil, ErrClaimTreeNotFound
  	}
  
  	return &cts[0], nil
  }
docs: // Get returns a claimtree for a specific organization by the given orgID.
  //
  // If an ownerID is provided then only public keys and claims related to that
  // user or machine will be returned.