<?php

function my_theme_enqueue_styles() {

    $parent_style = 'nisarg';

    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'nisarg-child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style ),
        wp_get_theme()->get('Version')
    );

}

add_action( 'wp_enqueue_scripts', 'my_theme_enqueue_styles' );
?>

<link rel="stylesheet" id="nisarg-css" href="https://mydomain/wp-content/themes/nisarg/style.css?ver=4.9.6" type="text/css" media="all">
<link rel="stylesheet" id="nisarg-child-style-css" href="https://mydomain/wp-content/themes/nisarg-child/style.css?ver=1.0.0" type="text/css" media="all">
<link rel="stylesheet" id="nisarg-style-css" href="https://mydomain/wp-content/themes/nisarg-child/style.css?ver=4.9.6" type="text/css" media="all">

<link rel="stylesheet" id="nisarg-css" href="https://mydomain/wp-content/themes/nisarg/style.css?ver=4.9.6" type="text/css" media="all">
<link rel="stylesheet" id="nisarg-style-css" href="https://mydomain/wp-content/themes/nisarg-child/style.css?ver=4.9.6" type="text/css" media="all">